{"id":3616,"date":"2023-07-16T12:37:36","date_gmt":"2023-07-16T12:37:36","guid":{"rendered":"https:\/\/statorials.org\/ko\/r%e1%84%8b%e1%85%b4-%e1%84%83%e1%85%a6%e1%84%8b%e1%85%b5%e1%84%90%e1%85%a5-%e1%84%90%e1%85%a6%e1%84%8b%e1%85%b5%e1%84%87%e1%85%b3%e1%86%af%e1%84%80%e1%85%aa-%e1%84%83%e1%85%a6%e1%84%8b%e1%85%b5\/"},"modified":"2023-07-16T12:37:36","modified_gmt":"2023-07-16T12:37:36","slug":"r%e1%84%8b%e1%85%b4-%e1%84%83%e1%85%a6%e1%84%8b%e1%85%b5%e1%84%90%e1%85%a5-%e1%84%90%e1%85%a6%e1%84%8b%e1%85%b5%e1%84%87%e1%85%b3%e1%86%af%e1%84%80%e1%85%aa-%e1%84%83%e1%85%a6%e1%84%8b%e1%85%b5","status":"publish","type":"post","link":"https:\/\/statorials.org\/ko\/r%e1%84%8b%e1%85%b4-%e1%84%83%e1%85%a6%e1%84%8b%e1%85%b5%e1%84%90%e1%85%a5-%e1%84%90%e1%85%a6%e1%84%8b%e1%85%b5%e1%84%87%e1%85%b3%e1%86%af%e1%84%80%e1%85%aa-%e1%84%83%e1%85%a6%e1%84%8b%e1%85%b5\/","title":{"rendered":"Data.table\uacfc r\uc758 \ub370\uc774\ud130 \ud504\ub808\uc784: \uc138 \uac00\uc9c0 \uc8fc\uc694 \ucc28\uc774\uc810"},"content":{"rendered":"

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R \ud504\ub85c\uadf8\ub798\ubc0d \uc5b8\uc5b4\uc5d0\uc11c data.frame\uc740<\/strong> R \ub370\uc774\ud130\ubca0\uc774\uc2a4\uc758 \uc77c\ubd80\uc785\ub2c8\ub2e4.<\/span><\/p>\n

data.table<\/strong> \ud328\ud0a4\uc9c0\uc758 setDF<\/strong> \ud568\uc218\ub97c \uc0ac\uc6a9\ud558\uc5ec \ubaa8\ub4e0 data.frame\uc744<\/strong> data.table<\/strong> \ub85c \ubcc0\ud658\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n

data.table\uc740 R\uc758 data.frame\uc5d0 \ube44\ud574 \ub2e4\uc74c\uacfc \uac19\uc740 \uc7a5\uc810\uc744 \uc81c\uacf5\ud569\ub2c8\ub2e4.<\/span><\/p>\n

1.<\/strong> data.table \ud328\ud0a4\uc9c0\uc758 fread<\/a> \ud568\uc218\ub97c \uc0ac\uc6a9\ud558\uba74 \ud30c\uc77c\uc744 data.frame\uc73c\ub85c \uc77d\ub294 read.csv<\/a> \uc640 \uac19\uc740 \uae30\ubcf8 R \ud568\uc218\ubcf4\ub2e4 \ud6e8\uc52c<\/em> \ube60\ub974\uac8c \ud30c\uc77c\uc744 data.table\ub85c \uc77d\uc744 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n

2.<\/strong> data.frame\ubcf4\ub2e4 \ud6e8\uc52c<\/em> \ube60\ub974\uac8c data.table\uc5d0\uc11c \uc791\uc5c5(\uc608: \uadf8\ub8f9\ud654 \ubc0f \uc9d1\uacc4)\uc744 \uc218\ud589\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n

3.<\/strong> data.frame\uc744 \ucf58\uc194\uc5d0 \uc778\uc1c4\ud560 \ub54c R\uc740 data.frame\uc758 \uac01 \ud589\uc744 \uc778\uc1c4\ud558\ub824\uace0 \uc2dc\ub3c4\ud569\ub2c8\ub2e4. \uadf8\ub7ec\ub098 data.table\uc740 \ucc98\uc74c 100\uac1c\uc758 \ud589\ub9cc \ud45c\uc2dc\ud558\ubbc0\ub85c \ub300\uaddc\ubaa8 \ub370\uc774\ud130 \uc138\ud2b8\ub85c \uc791\uc5c5\ud558\ub294 \uacbd\uc6b0 \uc138\uc158\uc774 \uc911\ub2e8\ub418\uac70\ub098 \ucda9\ub3cc\ud558\ub294 \uac83\uc744 \ubc29\uc9c0\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n

\ub2e4\uc74c \uc608\uc5d0\uc11c\ub294 \uc2e4\uc81c\ub85c data.frames\uc640 data.tables \uac04\uc758 \ucc28\uc774\uc810\uc744 \ubcf4\uc5ec\uc90d\ub2c8\ub2e4.<\/span><\/p>\n

\ucc28\uc774\uc810 #1: fread\ub97c \uc0ac\uc6a9\ud558\uc5ec \ub354 \ube60\ub974\uac8c \uac00\uc838\uc624\uae30<\/strong><\/span><\/h2>\n

\ub2e4\uc74c \ucf54\ub4dc\ub294 data.table \ud328\ud0a4\uc9c0\uc758 fread<\/strong> \ud568\uc218\uc640 R \ub370\uc774\ud130\ubca0\uc774\uc2a4\uc758 read.csv<\/strong> \ud568\uc218\ub97c \uc0ac\uc6a9\ud558\uc5ec 10,000\uac1c\uc758 \ud589\uacfc 100\uac1c\uc758 \uc5f4\ub85c \uad6c\uc131\ub41c \ub370\uc774\ud130 \ud504\ub808\uc784\uc744 \uac00\uc838\uc624\ub294 \ubc29\ubc95\uc744 \ubcf4\uc5ec\uc90d\ub2c8\ub2e4.<\/span><\/p>\n

 library<\/span> (microbenchmark)\nlibrary<\/span> (data.table)\n\n#make this example reproducible\n<\/span>set. seeds<\/span> (1)\n\n#create data frame with 10,000 rows and 100 columns\n<\/span>df <- as. data<\/span> . frame<\/span> (matrix(runif(10^4 * 100), nrow = 10^4))\n\n#export CSV to current working directory\n<\/span>write.write. csv<\/span> (df, \" test.csv<\/span> \", quote = FALSE<\/span> )\n\n#import CSV file using fread and read.csv and time how long it takes\n<\/span>results <- microbenchmark(\n  read.csv = read. csv<\/span> (\" test.csv<\/span> \", header = TRUE<\/span> , stringsAsFactors = FALSE<\/span> ),\n  fread = fread(\" test.csv<\/span> \", sep = \",\", stringsAsFactors = FALSE<\/span> ),\n  times = 10)\n\n#view results\n<\/span>results\n\nUnit: milliseconds\n     expr min lq mean median uq max neval cld\n read.csv 817.1867 892.8748 1026.7071 899.5755 926.9120 1964.0540 10 b\n    fread 113.5889 116.2735 136.4079 124.3816 136.0534 211.7484 10 a<\/strong><\/pre>\n
 \uacb0\uacfc\uc5d0\uc11c \uc6b0\ub9ac\ub294 read.csv<\/strong> \ud568\uc218\uc5d0 \ube44\ud574 \uc774 CSV \ud30c\uc77c\uc744 \uac00\uc838\uc624\ub294 \ub370 fread<\/strong> \uac00 \uc57d 10\ubc30 \ub354 \ube60\ub974\ub2e4\ub294 \uac83\uc744 \uc54c \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n
 \ub370\uc774\ud130 \uc138\ud2b8\uac00 \ud074\uc218\ub85d \uc774 \ucc28\uc774\ub294 \ub354\uc6b1 \ucee4\uc9d1\ub2c8\ub2e4.<\/span><\/p>\n
 \ucc28\uc774\uc810 #2: data.table\uc744 \uc0ac\uc6a9\ud55c \ub354 \ube60\ub978 \ub370\uc774\ud130 \uc870\uc791<\/strong><\/span><\/h2>\n
 \uc77c\ubc18\uc801\uc73c\ub85c data.table\uc740<\/strong> data.frame<\/strong> \ubcf4\ub2e4 \ud6e8\uc52c \ube60\ub974\uac8c \ub370\uc774\ud130 \uc870\uc791 \uc791\uc5c5\uc744 \uc218\ud589\ud560 \uc218\ub3c4 \uc788\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n
 \uc608\ub97c \ub4e4\uc5b4, \ub2e4\uc74c \ucf54\ub4dc\ub294 data.table\uacfc data.frame \ubaa8\ub450\uc5d0\uc11c \ub2e4\ub978 \ubcc0\uc218\ub85c \uadf8\ub8f9\ud654\ub41c \ubcc0\uc218\uc758 \ud3c9\uade0\uc744 \uacc4\uc0b0\ud558\ub294 \ubc29\ubc95\uc744 \ubcf4\uc5ec\uc90d\ub2c8\ub2e4.<\/span><\/p>\n
 library<\/span> (microbenchmark)\nlibrary<\/span> (data.table)\n\n#make this example reproducible\n<\/span>set.seed(1)\n\n#create data frame with 10,000 rows and 100 columns\nd_frame <- data. frame<\/span> (team=rep(c(' A<\/span> ', ' B<\/span> '), each=5000),\n                      points=c(rnorm(10000, mean=20, sd=3)))\n\n#create data.table from data.frame\n<\/span>d_table <- setDT(d_frame)\n\n#calculate mean of points grouped by team in data.frame and data.table\n<\/span>results <- microbenchmark(\n  mean_d_frame = aggregate(d_frame$points, list(d_frame$team), FUN=mean),\n  mean_d_table = d_table[ ,list(mean=mean(points)), by=team],\n  times = 10)\n\n#view results\n<\/span>results\n\nUnit: milliseconds\n         expr min lq mean median uq max neval cld\n mean_d_frame 2.9045 3.0077 3.11683 3.1074 3.1654 3.4824 10 b\n mean_d_table 1.0539 1.1140 1.52002 1.2075 1.2786 3.6084 10 a<\/strong><\/span><\/pre>\n
 \uacb0\uacfc\uc5d0\uc11c data.table\uc774<\/strong> data.frame<\/strong> \ubcf4\ub2e4 \uc57d 3\ubc30 \ube60\ub974\ub2e4\ub294 \uac83\uc744 \uc54c \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n
 \ub354 \ud070 \ub370\uc774\ud130 \uc138\ud2b8\uc758 \uacbd\uc6b0 \uc774 \ucc28\uc774\ub294 \ub354\uc6b1 \ucee4\uc9d1\ub2c8\ub2e4.<\/span><\/p>\n
 \ucc28\uc774\uc810 #3: data.table\ub85c \uc778\uc1c4\ub418\ub294 \ud589 \uc218\uac00 \uc801\uc2b5\ub2c8\ub2e4.<\/strong><\/span><\/h2>\n
 data.frame\uc744<\/strong> \ucf58\uc194\uc5d0 \uc778\uc1c4\ud560 \ub54c R\uc740 data.frame\uc758 \uac01 \ud589\uc744 \uc778\uc1c4\ud558\ub824\uace0 \uc2dc\ub3c4\ud569\ub2c8\ub2e4.<\/span><\/p>\n
 \uadf8\ub7ec\ub098 data.table\uc740<\/strong> \ucc98\uc74c 100\uac1c\uc758 \ud589\ub9cc \ud45c\uc2dc\ud558\ubbc0\ub85c \ub300\uaddc\ubaa8 \ub370\uc774\ud130 \uc138\ud2b8\ub85c \uc791\uc5c5\ud558\ub294 \uacbd\uc6b0 \uc138\uc158\uc774 \uc911\ub2e8\ub418\uac70\ub098 \ucda9\ub3cc\ud558\ub294 \uac83\uc744 \ubc29\uc9c0\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n
 \uc608\ub97c \ub4e4\uc5b4 \ub2e4\uc74c \ucf54\ub4dc\uc5d0\uc11c\ub294 \ub370\uc774\ud130 \ud504\ub808\uc784\uacfc 200\uac1c \ud589\uc758 data.table\uc744 \ubaa8\ub450 \uc0dd\uc131\ud569\ub2c8\ub2e4.<\/span><\/p>\n
 data.frame\uc744 \uc778\uc1c4\ud560 \ub54c R\uc740 \uac01 \ud589\uc744 \uc778\uc1c4\ud558\ub824\uace0 \uc2dc\ub3c4\ud558\ub294 \ubc18\uba74 data.table\uc740 \ucc98\uc74c 5\uac1c \ud589\uacfc \ub9c8\uc9c0\ub9c9 5\uac1c \ud589\ub9cc \ud45c\uc2dc\ud569\ub2c8\ub2e4.<\/span><\/p>\n
 library<\/span> (data.table)\n\n#make this example reproducible\n<\/span>set. seeds<\/span> (1)\n\n#create data frame\n<\/span>d_frame <- data. frame<\/span> (x=rnorm(200),\n                      y=rnorm(200),\n                      z=rnorm(200))\n#view data frame\n<\/span>d_frame\n\n               X Y Z\n1 -0.055303118 1.54858564 -2.065337e-02\n2 0.354143920 0.36706204 -3.743962e-01\n3 -0.999823809 -1.57842544 4.392027e-01\n4 2.586214840 0.17383147 -2.081125e+00\n5 -1.917692199 -2.11487401 4.073522e-01\n6 0.039614766 2.21644236 1.869164e+00\n7 -1.942259548 0.81566443 4.740712e-01\n8 -0.424913746 1.01081030 4.996065e-01\n9 -1.753210825 -0.98893038 -6.290307e-01\n10 0.232382655 -1.25229873 -1.324883e+00\n11 0.027278832 0.44209325 -3.221920e-01\n...\n#create data table\n<\/span>d_table <- setDT(d_frame)\n\n#view data table\n<\/span>d_table\n\n               X Y Z\n  1: -0.05530312 1.54858564 -0.02065337\n  2: 0.35414392 0.36706204 -0.37439617\n  3: -0.99982381 -1.57842544 0.43920275\n  4: 2.58621484 0.17383147 -2.08112491\n  5: -1.91769220 -2.11487401 0.40735218\n ---                                    \n196: -0.06196178 1.08164065 0.58609090\n197: 0.34160667 -0.01886703 1.61296255\n198: -0.38361957 -0.03890329 0.71377217\n199: -0.80719743 -0.89674205 -0.49615702\n200: -0.26502679 -0.15887435 -1.73781026<\/strong><\/pre>\n
 \uc774\ub294 \ud2b9\ud788 \uc2e4\uc218\ub85c \ucf58\uc194\uc5d0 \uc778\uc1c4\ud558\uace0 \uc2f6\uc9c0 \uc54a\uc740 \ub300\uaddc\ubaa8 \ub370\uc774\ud130 \uc138\ud2b8\ub85c \uc791\uc5c5\ud560 \ub54c data.table\uc774<\/strong> data.frame<\/strong> \uc5d0 \ube44\ud574 \uc81c\uacf5\ud558\ub294 \uc774\uc810\uc785\ub2c8\ub2e4.<\/span><\/p>\n
 \ucd94\uac00 \ub9ac\uc18c\uc2a4<\/strong><\/span><\/h2>\n
 \ub2e4\uc74c \ud29c\ud1a0\ub9ac\uc5bc\uc5d0\uc11c\ub294 R\uc5d0\uc11c \ub2e4\ub978 \uc77c\ubc18\uc801\uc778 \uc791\uc5c5\uc744 \uc218\ud589\ud558\ub294 \ubc29\ubc95\uc744 \uc124\uba85\ud569\ub2c8\ub2e4.<\/span><\/p>\n
 R\uc758 \ub370\uc774\ud130 \ud504\ub808\uc784\uc5d0 \ud589\uc744 \ucd94\uac00\ud558\ub294 \ubc29\ubc95<\/a>
 R\uc5d0\uc11c \ud2b9\uc815 \uc5f4\uc744 \ubcf4\uc874\ud558\ub294 \ubc29\ubc95<\/a>
 R\uc5d0\uc11c \uc22b\uc790 \uc5f4\ub9cc \uc120\ud0dd\ud558\ub294 \ubc29\ubc95<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
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